Mandrel



W. S. DOLL July 1o, 192s. `1,616,325

MANDREL Filed Aug. 1e, 1922 attorney,

55 Y 1 f fFigure 2 is a cross sectional view of SameA f i' ParenteelJuly 1o,` 1928.

WILLIAMS. DOLL; or AKRON, oHIo. l v

i MANDREL. i

y Application ined August 1s, 1922. semaine. 582,170. i

This invention rrelates to mandrels fory v .the manufacture ofvtubularAarticlessuchfas rubber, hose and .has particular relation to y new anduseful improvements in expansible 5 mandrels; the devicel of thisinventionbeL,

ingespecially-adapted for use in the manufacture of air brake hose orsimilar articles which are required to 'standgreat pressure.

' I Objects of the invention are to provide -a f mmechanicallyexpansible mandrel .of simple,y economical construction which will becom iposed of ew parts and which in use will provide a form uponwhichianair brake hose or otherv tubular article may be built up and '15expanded-or compacted/against the walls of a moldduring vulcanization.

A further. Objectis to provide', com

lbination with a mold,vanl expansible mold core or mandrel which iscomposed of sepa- 20 rable ksections arranged to provide an efficient;

- easily operable device 'andY which ywhen op-y erated willexerta greatexpansive or'ce and` to,V provide .means whereby Val-hose or'similararticle may be'expanded before being placed inxthe mold andl which maybefurtherex-Y. panded and compactedfagainst the walls-of the moldf duringvulcanization.4

` An ad'ditionalvobJect y1s to provide amanL drel uponwhich a hose'inaybe builtup andV 3U expanded during vulcanizationA Vand, wh1ch may bequickly contracted and conveniently.

removed from the hose when themanufacturing processyiscompleted.,l iiThefabove objects are"accomplishedl and :additional ends are: attainedby the novel i `'construction,y combination and arrangement ot'partshereinafter described and illustrated inthe accompanying drawingswherein I have shown apreferred embodiment ofthe invention, it-beingunderstoodthat the 1nventionv 1s capablejof various adaptations and thatchanges' and modifications mjaylbe,

made or lsubstitutions,resorted to 'which` come'withinthe scope of thelclaims hereunto' appended. l l l-. In theA ldra'wings in. which similarnu merals of reference, are fused 'todesignate .like

Y parts throughoutl the several viewsandfjin. o Which;:' .i 50

' cordance withwtliis invention showingjthe same with an air brake hosepositionedthereo in and taken as indicatedby the line 1-#1 of Figure 2,

l ure 1;

tobeconstructed.therein` u y y y l l Referring now-particularly; to myimprovedv mandrelythelnumeralsfl and 14 denote ,twoI

v vFigure is' a central, longitudinal;secw 5 ltional viewfo af device"constructed, 1n ac-l.

takenas indicated yby 2%2 of Fig- Figure 3V improved vmandrel.showingthe same in :an

expanded condition and't-aken as indicated bythetline 2&2 of Figure 1.

Figure 4 is a perspective -vieW of one. of

thevpart's of my improveddevice.

y iFigure 511s a perspective vlew'of'gone of a employed, in.

the wedge-shaped "members, carrying outthis invention. 1 v

cordance with thisinventionis av crossfse'ctional view" of my l;

Figure 3 andhavingthe centralgportiong ofl the mandrel broken away; Y'l' Proceeding now :to a detailed ldescription ofthe` invention `withreference-to the parV f ticular adaptation thereof illustratedv inthe?Y* drawing, `the numerals 7 -andg8 denoteolike portions of `atwo-partfmold. Each ofthe parts 7and8 are providedl with a plurality oflugs 9 vwhichfarer arranged vthereon with` the lugs i 9l onone partldirectly above the corresponding lugs 9 on. [the other part.z 'i 'iEach lugi9 is'fprovided withY a vertical bore.

lO'adaptedyto receive/ja bolt 11V .which u be employed toY secure thetwo'partsg7 andv 8 in assembled relation. The-,moldis pro-` vided with acylindrical' cavity 12 whichiny i shape-and size correspondsto thedesired shape and sizeof the-hose to be constructed therein. The cavityY12 :isl reduced at/each endv of thef mold to conform substantially toarcuate side portions each beingof .the same ythe shape andsize ofthe'jcavity of thehose 'size and k,shape and each lCorrespending,in 4

shape toallongitudinally extending-portion 10o the cavity of an airbrakehose orotherl'arofa hollow cylinderHadapted-to lit` within ticle to beconstructed thereon, i.

The numeral 15p-denotes.acollarlhaving a.y cylindrical cav'ityl` adapted-to receiveithe similar ends of the sideportionslgand 14.-

Tlief portions 13 and Mare oppositely posi-V v.

tioned within said" collar and secured thereted in suitable threadedbores formed insaid collar at, ldiametriically opposite points. Each.bolt 17 vis provided with a lreduced smooth inner endl wliichforms apinadapted' Vin byfmeans of the bolts 17 Whichrarevfitbetween thesections 13 and 14.

to loosely seat ina suitable bore 18, one of which is formed in each ofsaid sections so as to permit free radial movement of each section 13and 14.

At the other end of my improved mandrel,

with a bore 2O adapted to loosely receive the l bolt 22 which extendsthrough the bores in `said ring andthrough bores 2O in said sections.Tli'ebolt 22 is provided on each end with a head, nutor -otlicrsuitablemeans to loosely retain the sections in assembled relation. Eachbore 20 is counterbored as at 21 to allow a limited radialinovement ofsaid section-s. The sections 13 and 14 are provided with opposing *faces23 which are disposed obliquely to a radius of the mandrel, with theopposing edges 23 converging outwardly to form a longitudinallyextending slot `adapted to receive the wedge-shaped member l24hereinafter described. The wedge-shaped members 24 extend longitudinallyof the mandrel and each member is Kprovided with an outer face whichconstitutes a portion of a cylinder and corresponds in contour to thecontour ofthe members 13 and 14, but'is preferably formed relativelynarrowei1 than `'the said side portions. Each'member 24 is wedge-shaped,being provided with oblique sides 24a and 24h, which are adapted tocontact with the oblique faces 23 of the side members 13and,` 14 so thatwhen the members v24 are forced outwardly, flush with the outer faces ofthe members 13 and .-14, a perfect cylindrical form will be provided.Each member 24 Vis provided ontlie inner face thereof with a. centrallypositioned notch 25 which is formed therein for 'a purpose presently'toappear. Each member 24 has a relatively lthick central portion andtheinner face thereof tapers from the notch 25 so the saidmember is Yrelatively thinner at each end thereof. Each y member is .thus providedon the innerv face thereof with the flat -faces 24c which extend atanangle to the axis ofthe mandrel.

VThe numeral 26 denotesa rod which eX- tends coaxially through themandrel and is provided centrally thereof with an enlarged cylindrical,centralY portion- 27 which is adapted to seatin the notch 25 to hold therod 26 from longitudinal movement, relative to the mandrel. The rod 26is provided adjacent the forward end thereof withv right hand screwthread-s 26a and is provided adjacentl the other end thereof with Vlefthand screw threads 2Gb. 1 V i V The wedge-shaped member 28 is mounted onthev threaded portions of the rod 26 ad- Y `iacent each end thereof soas to be positioned between the opposing faces 24C of the members 24.One of the wedgeeshaped members 23 is illustrated in Figure4 and eachwedge member is provided with a longitudinally eX- A.

'of the mandrel and'is provided with a suitable hand wheel 29 or otherconvenient means Y whereby it may be rotated "to move the wedgeme1nbers28 toward and from the center thereof.

Inyuse, the hand wheel 29 is loperated to contract the mandrel'liereinbefore set forth and the material of which the article vis to beformed is wound thereon.

In the manufact-ure of anlair brake hose, the mandrel is first coveredwith a layer of rubber and textile fabric, cord fabric or othersuitablehose building material is then wound on the layer of rubber' toform a carcass of the desired number `of plies. "The carcass thus formedis then covered'with a vlayer of rubber and themandrel with the hosethereon is placed wit-hin the cavity of a two-part mo-ld. The parts 7and 8 of the mold may be secured in operative relation bymeans vof thebolts 11 or by being placed vin a press or .by any suitable means'.` Thewheel 29 is then operated to move the wedge-members 28toward the centerof the rod 26 thus forcing the members 24 outwardly. As the members 24are moved outwardly the inclined lateral faces 24a engage the beveledfaces`23 ofthe members 13 and 14 and spread them laterally apart forminga. cylindrical mandrel.

When operated in the imanner above defy scribed, the hose will bestretchedV and compacted againsttlie wall of the moldV duringvulcanization andthe product thus formed will be' strong and durableandcapable of withstanding great pressure. K

l lf'desired, the mandrel may be expanded and the article thus formedmay be vulcanized without being placed in a mold or the article may bewoundvwith cloth or otherwise lrestrained during vulcanization. l`Having thus illustrated my' inventionV and `retained therein, means toloosely retainthe opposite ends of said 'members in assembled relation,wedge members positioned between the opposing edges of said sidemembers,

iso

wedge members comprising longitudi-V nallyeXtending portions of the samecyline ,saidV side members being oppositely positioned witli'tlieopposing edges thereof in Vparallel spaced relation, a cylindricalcollar,l the similar ends of said side members being positioned in saidcollar and being loosely retained therein, means to loosely retain theopposite ends of said members in assembled relation, wedge memberspositioned between the opposing edges of said side members said wedgemembers comprising longitudinally r v extending portions of the sainecylinder, said axis of the mandrel, wedges mounted Vbe-V fwedge Amembersbeing provided on the inner faces thereof with surfaces inclined to thetween said inclined faces, each wedge provided with a threaded bore, athreaded rod Vprojecting forwardly from said ,collar and extendingco-axially through said mandrel,

said wedges operatively mountedoii said rod A i and adapted to be'movedaxiallytliereon yby a rotary' movement thereof 3. In a device of thecla-ss l described ink combination,a two part, mold, and amandrelpositioned therein,y said mandrel coin-l prising like sideii'ieinbei's,'each corresponde L ing to a longitudinally extendingportion of a cylinder, a cylindrical collar positioned outside of saidmold, saidy side meinbersbeing oppositely positioned with the similarendsy thereof received in said collar, means to `secure said memberstosaid collar"y so the saine maybe moved radiallythereof, wedge inemvbers positioned between said .side members a` rod extendingcoaXially"througlisaid man-"f drel and vprojecting forwardly from, said-'i I collar, a hand wheel ontheoiiter projecting end of said rod andmeans mounted on said frodfwhereby a rotary movement thereof will forcevsaid Wedgeniembers apartand expand the mandrel. Y' l In testimonywhereof IhaviJ h'eeuntos'et 'l WILLIAM sDoLL. 'i

my hand. y

